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Yokosuka

35.284° N   139.667° E  ·  9 M
34 /100
PEAK
Nothing usable opens up tonight.
NO USABLE WINDOW · ASTRO DARK 01:00–04:00 · MOON 0%
Transparency
0.26
Seeing
0.63
Cloud
45%
Moon
0%

Poor tonight

Hour by hour, local to Yokosuka. Colour encodes the score and nothing else; every other measurement is luminance.

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
01
02
03
04
05
34
32
11
2
0
Low cloud
43%
28%
63%
90%
100%
Mid cloud
4%
10%
19%
9%
17%
High cloud
0%
40%
77%
37%
4%
Transparency
0.23
0.23
0.24
0.26
0.25
Seeing
0.63
0.62
0.54
0.52
0.56
Moon clear
down
down
down
down
down
Inspect

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Why this hour scored what it did
01 Poor · 34/100
Starting from
100
Cloud
−45
Transparency
−17
Seeing
−4
Moonlight
−0
Darkness
−0
Score
34
CLOUD 45% LOW 43% MID 4% HIGH 0% SUN -36.8° MOON -36.0° / 0% WIND 6 TEMP 22°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

What are you doing tonight?

The same forecast, weighted for the target. Planetary work barely cares about moonlight; long exposures die on high cloud a visual observer would never notice.

SET UP 00:30 · OBSERVE 01:00–02:00 · 1H · MEAN 37

Darkness and moonlight dominate. Faint fuzzies need a genuinely dark sky more than they need steady air.

010305
CLOUD RETURNS 02:00
SET UP 00:30 · OBSERVE 01:00–02:00 · 1H · MEAN 38

Seeing is everything and moonlight is irrelevant. Bright targets punch through twilight, so darkness barely counts.

010305
CLOUD RETURNS 02:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 00:30 · OBSERVE 01:00–02:00 · 1H · MEAN 35

Tolerates soft seeing, but high cloud wrecks a wide frame and moonlight raises the background everywhere.

010305
CLOUD RETURNS 02:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

Needs conditions to hold still for hours. Sustained transparency matters more than any single good hour.

010305
CLOUD NEVER DROPS BELOW 45%
SET UP 00:30 · OBSERVE 01:00–02:00 · 1H · MEAN 36

Naked eye, whole sky. Total cloud and moonlight are the only things that count.

010305
CLOUD RETURNS 02:00
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The next week of nights

Tonight · 12 Aug
34
Poor
MOON 0%
Tomorrow · 13 Aug
3
Clouded out
MOON 1%
Friday · 14 Aug
22
Poor
MOON 5%
Saturday · 15 Aug
59
Good
MOON 8%
21:00–22:00
Sunday · 16 Aug
57
Good
MOON 19%
21:00–22:00
Monday · 17 Aug
44
Fair
MOON 28%
21:00–22:00
Tuesday · 18 Aug
58
Good
MOON 37%
21:00–22:00
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Nearby locations

About this forecast

Conditions for Yokosuka, Japan are computed from the MET Norway forecast model for these exact coordinates, combined with sun and moon positions we calculate directly. The score weighs cloud cover by layer, atmospheric transparency, estimated seeing, moonlight and how dark the sky actually gets. Read the full method →